In the video, the detained man asks why he was hit, and is told it is because he was resisting. When you rewind the video, you can see how the detained man does raise his arm as he turns his head.

'Obviously, you want to gain the person's voluntary compliance, but that may not always be possible.'—Brad Fawcett, Justice Institute of B.C. instructor

Brad Fawcett, a use-of-force instructor at the Justice Institute, teaches the rookies that resistance isn't always a clear-cut issue, but when it happens, it usually happens at first contact, which is usually when a suspect is being handcuffed.

Fawcett says maintaining control is one of the core tenets of police work: Control of themselves, control of a situation, and control of a subject.

"Obviously, you want to gain the person's voluntary compliance, and that may not always be possible," Fawcett said.

When asked "is there ever a time when officers are allowed to hit or punch?" he says: "Oh, certainly. Certainly."

"Again, it's all dictated by the nature of resistance that the person demonstrates," Fawcett said.

Police recruits simulate an arrest scenario during training at the Justice Institute of B.C. (CBC)

Fawcett leads the officers-in-training in a pretend barroom arrest. Someone pretends to record the event on a camera and yells "this is going on YouTube."

Fawcett says simulating, then debriefing events that will be encountered in the real world is a large part of training.

With every scenario, another instructor asks the same question: "Who's in control?"